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CitrixCTX316325
HistoryJun 23, 2021 - 11:06 a.m.

Citrix Hypervisor Security Update

2021-06-2311:06:42
support.citrix.com
71

6.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

0.001 Low

EPSS

Percentile

16.0%

Two security issues have been identified in Citrix Hypervisor 8.2 LTSR, each of which may allow privileged code in a guest VM to cause the host to crash or become unresponsive. These issues only affect Citrix Hypervisor 8.2 LTSR.
These issues have the following CVE identifiers:

  • CVE-2021-3416
  • CVE-2021-20257
    CVE ID| Description| Pre-conditions
    —|—|—
    CVE-2021-3416| privileged code in a guest VM may cause the host to crash or become unresponsive| must be able to execute privileged code in the guest VM
    CVE-2021-20257| privileged code in a guest VM may cause the host to crash or become unresponsive| must be able to execute privileged code in the guest VM
How to protect your server from attacks?

6.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:N/I:N/A:P

0.001 Low

EPSS

Percentile

16.0%

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